Abstract
Photovoltaic (PV) arrays are highly compatible with DC microgrids as they are DC sources. However, the uncontrolled penetration of PV power in a DC grid will lead to overvoltage problems. This paper proposes an Integrated Power Control (IPC) Module for multiple PV sources in a DC grid which allows PV sources to deliver maximum power in MPPT mode and also works as a voltage controller to maintain DC bus voltage in droop mode. Thus, the IPC module integrates MPPT and DC bus voltage regulation in a single controller, reducing the complexity of the system and avoiding the need for the controller to switch between MPPT and droop mode as in conventional methods. Further, during unequal shading conditions between the multiple PV sources, the proposed IPC module effectively shares the power and operating the PV sources to deliver the available power to the DC bus. Thereby, the total efficiency of the system is increased. The IPC module is implemented in simulation for multiple PV sources on a DC grid, and maximum power tracking and power-flow management are verified. The prototype hardware setup is developed, and the results are presented to demonstrate the simple and cost benefited IPC module.
Published Version
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